Effects of substrates and IBA on the rotting of herbaceous cuttings of VR 43-43 grapevine rootstoks<b/>

Abstract

The present work had the aim of evaluating the rooting of herbaceous cuttings of VR 43-43 grapevine rootstocks with three IBA concentrations (0; 1,000 and 2,000 mg.L^-1) and two substrates (vermiculite and carbonized rice husk). A randomized design was used in a 2 x 3 factorial arrangement with five replications and 10 cuttings per plot. The appraised variables were: percentage of leaf retention, percentage of rooted cuttings; number of roots; length of roots (cm); percentage of sprouting, percentage of alive cuttings; mass of dry and fresh matter of the roots for each cutting (g). There was only influence of the substrate in the fresh and dry mass of the roots, with the largest averages observed for the carbonized rice husk. For the IBA doses, it was verified the highest survival percentage and percentage of rooted cuttings in the control group (without IBA application) and with IBA at 1,000 mg.L^-1. There were no significant differences for the interaction between substrate and IBA application. Carbonized rice husk is suitable for the rooting of herbaceous cuttings of VR 43-43 rootstocks, not being necessary the IBA application.